Valve for spray guns



Dec. 3l, 1935- y w. L. RowLAND VALVE FOR SPRAY GUNS Filed Aug. 4, 1934 lo w AF/e.

IN l/w roR Patented Dec. 31, 1935 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates generally to spraying apparatus'such as is 'used by orchardists, and -particularly to a spray gun.

The main object of this invention is the pro- 5 vision of a spray gun having a special form of control valve and means for operating same.

The second object is to provide a control for the spray valve which will be quick in operation, not easily rendered inoperative and economical in l its handling of the spray materials.

These, and other objects, will become more apparent from the specification following as illustrated in the accompanying drawing, in which:

Fig. l is a plan of the device.

l Fig. 2 is a side elevation thereof.

Fig. 3 is a longitudinal section through the valve.

Fig. 4 is an end elevation showing the device with the supply line connected to the end of the 20 handle.

Fig. 5 is a section-taken along the line 5-5 in Similar numbers of reference refer to similar parts throughout the several views.

25 Referring in detail to the drawing, there is shown a barrel I0 of a spray gun whose nozzle I I is threaded onto the barrel IIJ. The nozzle II has formed therein a chamber I2 which contains a guide I3 vhaving a longitudinally slidable stem I4 3o which projects through the mixing disk I5 whose openings I6 are preferably spirally disposed about the axis of the stem I4.

Against the disk I5 is placed a packing ring I1 on the outside of which is a-thin plate I8 provided 35 with a central opening I9 through which the spray material is discharged. 'I'he point 20 is preferably of a size to pass through the opening I9 When the valve is closed, the closing action itself being provided by means of a resilient tip 2I which 40 surrounds the point 20.

The plate I8 is held against the packing I1 by means of a threaded cap 22 which is screwed upon the end of the nozzle II.

'Ihe barrel I0 is threaded into the body 23 45 'which contains a chamber 24 to which spray material may be admitted through the branch inlet 25 from the spray line or hose 26, preferably provided with a swivel coupling (not shown). .f

In the opposite end of the body 23 and in line 50 with the barrel I0 is threaded the tubular handle 21 whose outermost end 28 is provided with a plug 29 which is used only when the spray is admitted by way of the hose 26. Where it is desired to have the spray enter the gun by way of the handle 21 55 a plug 30 is inserted into the branch 25 and the connecting pipe 3I is inserted in place of the plug 29 (as shown in Fig. 4).

The stem I4 extends through the chamber 24 into the handle 21. A spring 32 is placed around the end of the stem I4, one end of which re-acts against the plug 29 and the other end of which re-acts against the washer 33 which bears against the pin 34 on the stern I4. 5

Transversely journaled in the body 23 is a rock shaft 35 around the opposite ends of which are placed the stuffing boxes 36. The projecting ends of the shaft 35 have secured thereto the ends of the operating lever 31 which is bent (as shown) to 10 suit the convenience of the operator.

Mounted on the shaft 35 is a forked arm 38 whose pin 39 passes through the stem I4.

'Ihe operation of the device is as follows: Assuming the parts to be in the position shown in Fig. 2 and it is desired to use the gun for spraying purposes it is only necessary for the operator to press the lever 31 toward the handle 21, which will cause the shaft 35 to rock and, through the forked arm 38, impart a sliding motion to the stem I4, the amount of which Varies with the movement of the lever 31, permitting the spray to be discharged from the opening I9 until the lever 31 is released and returns to a rest position, under the action of the spring 32.

In spray guns now in common use it is the customary practice to control the movement of the valve by means of a screw, which motion is not only slow but also tends to wear the tip 2|, and in addition thereto the screw type of lcontrol is subject to automatic opening under pressure, thereby causing an objectionable waste of materials.

It will be noted that the point 20, while not serving as a closure for the outlet opening I9, does serve to maintain a fixed diameter of outlet opening thereby preventing an accumulation of spray materials or foreign substances in the opening I 9.

I claim:

A spray gun including a body having a handle 40 mounted at one end thereof and a barrel at the opposite end thereof in alignment with said handle said body, handle and barrel constituting a valve casing, means for admitting spray material to the interior of said body, a nozzle on the outer end of said barrel communicating with said body by way of said barrel, said nozzle having an outlet opening therein, a valve stem lying wholly within said casing and slidably movable therein having a soft tip forming a closure for said nozzle outlet opening, a rock shaft mounted in said body having a forked arm connected to said stem, a lever on the outside of said body adjacent to said handle connected to said rock shaft, and a spring within said handle for urging said stem to move its soft seat over the outlet opening in said nozzle.

WILLIAM L. ROWLAND. 

